1 Judith Agnew CCLRC Rutherford Appleton Laboratory Radio Communications Research Unit UV Raman lidar Chilbolton Observatory Review April 2003-2004.

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Presentation transcript:

1 Judith Agnew CCLRC Rutherford Appleton Laboratory Radio Communications Research Unit UV Raman lidar Chilbolton Observatory Review April

2 Summary of events  CWAVE campaign June-July 2003: comparison of UV Raman lidar data with Met Office Radiometrics radiometer and co-located Aberystwyth polarimetric lidar.  Examples of high cirrus cloud.  Laser repair.  Implementation of new data acquisition system.

3 Lidar, radiometer, radiosonde humidity mixing ratio Lidar Radiometer Radiosonde Average signal in each radiometer range bin during lidar measurement period

4 Water vapour measurements 13/06/03 Raman lidar RadiometerDifference

5 Water vapour measurements 25/06/03 Raman lidar RadiometerDifference

6 High cirrus clouds 07/05/03 09/06/03

7 Lidar upgrades  New data acquisition system about to be delivered. Installation work to begin immediately, while keeping existing system operational.  Will upgrade the capabilities from 8 bit analog to 12 bit analog and photon counting  Photon counting will improve the measurement of small signals, especially by night.  Higher resolution analog measurements beneficial when photon counting is not suitable, for example by day in the Raman scattering channels.  Laser underwent extensive maintenance and now has much improved beam power.